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OBJECTIVE To compare serum concentrations of lipoproteins and apolipoproteins in insulin-dependent diabetic patients with and without retinopathy. METHODS A cross-sectional study was performed on 42 diabetic adolescents and young adults with different degrees of retinopathy. The mean +/- SD age of the patient was 21.1 years (range 12.8-27.9 years); their mean duration of diabetes was 12.3 years (range 7.1-19.9 years). Their glycosylated haemoglobin (HbA1c) and fructosamine were respectively 10.2% (8.2-15.4%) and 280.8 mumol/l (202.1-458.5 mumol/l). Forty-two diabetics without retinopathy similar to the study population as regards age, sex, duration of disease, HbA1c and microalbuminuria values, and 42 healthy subjects, served as controls. RESULTS Serum lipid and lipoprotein concentrations were not different from those of healthy controls in patients either with or without retinopathy. The diabetic patients were subdivided in two groups according to the degree of their retinopathy: background and preproliferative/proliferative retinopathy. Patients with preproliferative/proliferative retinopathy were found to have significantly higher lipoprotein (a) values than the other group (background, 73.3 IU/l; preproliferative/proliferative, 205.9 IU/l; p < 0.001). CONCLUSIONS The increase in lipoprotein (a) levels might play a role in the development of severe retinopathy.
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